1216722124 has 6 divisors (see below), whose sum is σ = 2129263724. Its totient is φ = 608361060.

The previous prime is 1216722107. The next prime is 1216722127. The reversal of 1216722124 is 4212276121.

It is a junction number, because it is equal to n+sod(n) for n = 1216722092 and 1216722101.

It is not an unprimeable number, because it can be changed into a prime (1216722127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152090262 + ... + 152090269.

Almost surely, 2^1216722124 is an apocalyptic number.

It is an amenable number.

1216722124 is a deficient number, since it is larger than the sum of its proper divisors (912541600).

1216722124 is a wasteful number, since it uses less digits than its factorization.

1216722124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304180535 (or 304180533 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

The square root of 1216722124 is about 34881.5441745345. The cubic root of 1216722124 is about 1067.5719024234.

Adding to 1216722124 its reverse (4212276121), we get a palindrome (5428998245).

The spelling of 1216722124 in words is "one billion, two hundred sixteen million, seven hundred twenty-two thousand, one hundred twenty-four".